Vacuum adiabatic body and refrigerator

ABSTRACT

A vacuum adiabatic body includes a first plate; a second plate; a seal; a support; a heat resistance unit; and an exhaust port, wherein the heat resistance unit includes a conductive resistance sheet having one end connected to the first plate member, the conductive resistance sheet resisting heat conduction flowing along a wall for the third space, the heat resistance unit further includes a side frame connected to the conductive resistance sheet, the side frame defining at least one portion of the wall for the third space, the side frame includes a first mounting surface connected to the conductive resistance sheet and a second mounting surface connected to the second plate, and the second mounting surface is supported by the support.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation application of U.S. patentapplication Ser. No. 16/929,523 filed Jul. 15, 2020, which is aContinuation application of U.S. patent application Ser. No. 15/749,140filed Jan. 31, 2018 (now U.S. Pat. No. 10,753,671), which is a U.S.National Stage Application under 35 U.S.C. § 371 of PCT Application No.PCT/KR2016/008507, filed Aug. 2, 2016, which claims priority to KoreanPatent Application No. 10-2015-0109625, filed Aug. 3, 2015, whose entiredisclosures are hereby incorporated by reference.

FIELD

The present disclosure relates to a vacuum adiabatic body and arefrigerator.

BACKGROUND

A vacuum adiabatic body is a product for suppressing heat transfer byvacuumizing the interior of a body thereof. The vacuum adiabatic bodycan reduce heat transfer by convection and conduction, and hence isapplied to heating apparatuses and refrigerating apparatuses. In atypical adiabatic method applied to a refrigerator, although it isdifferently applied in refrigeration and freezing, a foam urethaneadiabatic wall having a thickness of about 30 cm or more is generallyprovided. However, the internal volume of the refrigerator is thereforereduced. In order to increase the internal volume of a refrigerator,there is an attempt to apply a vacuum adiabatic body to therefrigerator.

First, Korean Patent No. 10-0343719 (Reference Document 1) of thepresent applicant has been disclosed. According to Reference Document 1,there is disclosed a method in which a vacuum adiabatic panel isprepared and then built in walls of a refrigerator, and the exterior ofthe vacuum adiabatic panel is finished with a separate molding such asStyrofoam (polystyrene). According to the method, additional foaming isnot required, and the adiabatic performance of the refrigerator isimproved. However, manufacturing cost is increased, and a manufacturingmethod is complicated.

As another example, a technique of providing walls using a vacuumadiabatic material and additionally providing adiabatic walls using afoam filling material has been disclosed in Korean Patent PublicationNo. 10-2015-0012712 (Reference Document 2). According to ReferenceDocument 2, manufacturing cost is increased, and a manufacturing methodis complicated.

As another example, there is an attempt to manufacture all walls of arefrigerator using a vacuum adiabatic body that is a single product. Forexample, a technique of providing an adiabatic structure of arefrigerator to be in a vacuum state has been disclosed in U.S. PatentLaid-Open Publication No. US20040226956A1 (Reference Document 3).

However, it is difficult to obtain an adiabatic effect of a practicallevel by providing the walls of the refrigerator to be in a sufficientvacuum state. Specifically, it is difficult to prevent heat transfer ata contact portion between external and internal cases having differenttemperatures. Further, it is difficult to maintain a stable vacuumstate. Furthermore, it is difficult to prevent deformation of the casesdue to a sound pressure in the vacuum state. Due to these problems, thetechnique of Reference Document 3 is limited to cryogenic refrigeratingapparatuses, and is not applied to refrigerating apparatuses used ingeneral households.

Embodiments provide a vacuum adiabatic body and a refrigerator, whichcan obtain a sufficient adiabatic effect in a vacuum state and beapplied commercially. Embodiments also provide a design reference byconsidering the strength and deformation of a side frame provided in thevacuum adiabatic body.

In one embodiment, a vacuum adiabatic body includes: a first platemember defining at least one portion of a wall for a first space; asecond plate member defining at least one portion of a wall for a secondspace having a different temperature from the first space; a sealingpart sealing the first plate member and the second plate member toprovide a third space that has a temperature between the temperature ofthe first space and the temperature of the second space and is in avacuum state; a supporting unit maintaining the third space; a heatresistance unit for decreasing a heat transfer amount between the firstplate member and the second plate member; and an exhaust port throughwhich a gas in the third space is exhausted, wherein the heat resistanceunit includes a conductive resistance sheet having one end connected tothe first plate member, the conductive resistance sheet resisting heatconduction flowing along a wall for the third space, the heat resistanceunit further includes a side frame connected to the conductiveresistance sheet, the side frame defining at least one portion of thewall for the third space, the side frame includes a first mountingsurface connected to the conductive resistance sheet and a secondmounting surface connected to the second plate member, and the secondmounting surface is supported by the supporting unit.

In another embodiment, a vacuum adiabatic body includes: a first platemember defining at least one portion of a wall for a first space; asecond plate member defining at least one portion of a wall for a secondspace having a different temperature from the first space; a sealingpart sealing the first plate member and the second plate member toprovide a third space that has a temperature between the temperature ofthe first space and the temperature of the second space and is in avacuum state; a supporting unit maintaining the third space; a heatresistance unit for decreasing a heat transfer amount between the firstplate member and the second plate member; and an exhaust port throughwhich a gas in the third space is exhausted; wherein the heat resistanceunit includes a conductive resistance sheet having one end connected tothe first plate member, the conductive resistance sheet resisting heatconduction flowing along a wall for the third space, the heat resistanceunit further includes a side frame connected to the conductiveresistance sheet, the side frame defining at least one portion of thewall for the third space, and the side frame includes a first mountingsurface connected to the conductive resistance sheet and a secondmounting surface connected to the second plate member.

In still another embodiment, a refrigerator includes: a main bodyprovided with an internal space in which storage goods are stored; and adoor provided to open/close the main body from an external space,wherein, in order to supply a refrigerant into the internal space, therefrigerator includes: a compressor for compressing the refrigerant; acondenser for condensing the compressed refrigerant; an expander forexpanding the condensed refrigerant; and an evaporator for evaporatingthe expanded refrigerant to take heat, wherein at least one of the mainbody and the door includes a vacuum adiabatic body, wherein the vacuumadiabatic body includes: a first plate member defining at least oneportion of a wall for the internal space; a second plate member definingat least one portion of a wall for the external space; a sealing partsealing the first plate member and the second plate member to provide avacuum space part that has a temperature between a temperature of theinternal space and a temperature of the external space and is in avacuum state; a supporting unit maintaining the vacuum space part; aheat resistance unit for decreasing a heat transfer amount between thefirst plate member and the second plate member; and an exhaust portthrough which a gas in the vacuum space part is exhausted, wherein thevacuum adiabatic body provided in the door includes: a conductiveresistance sheet having one end connected to the first plate member, theconductive resistance sheet resisting heat conduction flowing along awall for the vacuum space part; and a side frame connected to theconductive resistance sheet, the side frame defining at least oneportion of the wall for the vacuum space part, wherein the side frameincludes a first mounting surface connected to the conductive resistancesheet, a second mounting surface connected to the second plate member,and a connection part connecting the first mounting surface and thesecond mounting surface to each other.

According to the present disclosure, it is possible to provide a vacuumadiabatic body having a vacuum adiabatic effect and a refrigeratorincluding the same.

BRIEF DESCRIPTION OF DRAWINGS

The embodiments will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

FIG. 1 is a perspective view of a refrigerator according to anembodiment.

FIG. 2 is a view schematically showing a vacuum adiabatic body used in amain body and a door of the refrigerator.

FIG. 3 is a view showing various embodiments of an internalconfiguration of a vacuum space part.

FIG. 4 is a view showing various embodiments of conductive resistancesheets and peripheral parts thereof.

FIG. 5 is a view showing in detail a vacuum adiabatic body according toanother embodiment.

FIG. 6 illustrates graphs showing minimum thicknesses of a side framewith respect to limiting stresses of the side frame.

FIG. 7 illustrates graphs showing relationships between lengths of afirst mounting surface and minimum thicknesses of the side frame.

FIG. 8 illustrates graphs showing relationships between thicknesses ofthe side frame and deformations of the side frame.

FIG. 9 illustrates graphs showing relationships between lengths of thefirst mounting surface and minimum thicknesses of the side frame.

FIG. 10 illustrates graphs showing changes in adiabatic performance andchanges in gas conductivity with respect to vacuum pressures by applyinga simulation.

FIG. 11 illustrates graphs obtained by observing, over time andpressure, a process of exhausting the interior of the vacuum adiabaticbody when a supporting unit is used.

FIG. 12 illustrates graphs obtained by comparing vacuum pressures andgas conductivities.

DETAILED DESCRIPTION

Reference will now be made in detail to the embodiments of the presentdisclosure, examples of which are illustrated in the accompanyingdrawings.

In the following detailed description of the preferred embodiments,reference is made to the accompanying drawings that form a part hereof,and in which is shown by way of illustration specific preferredembodiments in which the disclosure may be practiced. These embodimentsare described in sufficient detail to enable those skilled in the art topractice the disclosure, and it is understood that other embodiments maybe utilized and that logical structural, mechanical, electrical, andchemical changes may be made without departing from the spirit or scopeof the disclosure. To avoid detail not necessary to enable those skilledin the art to practice the disclosure, the description may omit certaininformation known to those skilled in the art. The following detaileddescription is, therefore, not to be taken in a limiting sense.

In the following description, the term ‘vacuum pressure’ means a certainpressure state lower than atmospheric pressure. In addition, theexpression that a vacuum degree of A is higher than that of B means thata vacuum pressure of A is lower than that of B.

FIG. 1 is a perspective view of a refrigerator according to anembodiment. FIG. 2 is a view schematically showing a vacuum adiabaticbody used in the main body and the door of the refrigerator. In FIG. 2 ,a main body-side vacuum adiabatic body is illustrated in a state inwhich top and side walls are removed, and a door-side vacuum adiabaticbody is illustrated in a state in which a portion of a front wall isremoved. In addition, sections of portions at conductive resistancesheets are provided are schematically illustrated for convenience ofunderstanding.

Referring to FIG. 1 and FIG. 2 , the refrigerator 1 includes a main body2 provided with a cavity 9 capable of storing storage goods and a door 3provided to open/close the main body 2. The door 3 may be rotatably ormovably disposed to open/close the cavity 9. The cavity 9 may provide atleast one of a refrigerating chamber and a freezing chamber.

Parts constituting a freezing cycle in which cold air is supplied intothe cavity 9 may be included. Specifically, the parts include acompressor 4 for compressing a refrigerant, a condenser 5 for condensingthe compressed refrigerant, an expander 6 for expanding the condensedrefrigerant, and an evaporator 7 for evaporating the expandedrefrigerant to take heat. As a typical structure, a fan may be installedat a position adjacent to the evaporator 7, and a fluid blown from thefan may pass through the evaporator 7 and then be blown into the cavity9. A freezing load is controlled by adjusting the blowing amount andblowing direction by the fan, adjusting the amount of a circulatedrefrigerant, or adjusting the compression rate of the compressor, sothat it is possible to control a refrigerating space or a freezingspace.

The vacuum adiabatic body includes a first plate member (or first plate)10 for providing a wall of a low-temperature space, a second platemember (or second plate) 20 for providing a wall of a high-temperaturespace, a vacuum space part (or vacuum space) 50 defined as a gap partbetween the first and second plate members 10 and 20. Also, the vacuumadiabatic body includes the conductive resistance sheets 60 and 62 forpreventing heat conduction between the first and second plate members 10and 20.

A sealing part (or seal) 61 for sealing the first and second platemembers 10 and 20 is provided such that the vacuum space part 50 is in asealing state. When the vacuum adiabatic body is applied to arefrigerating or heating cabinet, the first plate member 10 may bereferred to as an inner case, and the second plate member 20 may bereferred to as an outer case. A machine chamber 8 in which partsproviding a freezing cycle are accommodated is placed at a lower rearside of the main body-side vacuum adiabatic body, and an exhaust port 40for forming a vacuum state by exhausting air in the vacuum space part 50is provided at any one side of the vacuum adiabatic body. In addition, apipeline 64 passing through the vacuum space part 50 may be furtherinstalled so as to install a defrosting water line and electric lines.

The first plate member 10 may define at least one portion of a wall fora first space provided thereto. The second plate member 20 may define atleast one portion of a wall for a second space provided thereto. Thefirst space and the second space may be defined as spaces havingdifferent temperatures. Here, the wall for each space may serve as notonly a wall directly contacting the space but also a wall not contactingthe space. For example, the vacuum adiabatic body of the embodiment mayalso be applied to a product further having a separate wall contactingeach space.

Factors of heat transfer, which cause loss of the adiabatic effect ofthe vacuum adiabatic body, are heat conduction between the first andsecond plate members 10 and 20, heat radiation between the first andsecond plate members 10 and 20, and gas conduction of the vacuum spacepart 50.

Hereinafter, a heat resistance unit provided to reduce adiabatic lossrelated to the factors of the heat transfer will be provided. Meanwhile,the vacuum adiabatic body and the refrigerator of the embodiment do notexclude that another adiabatic means is further provided to at least oneside of the vacuum adiabatic body. Therefore, an adiabatic means usingfoaming or the like may be further provided to another side of thevacuum adiabatic body.

FIG. 3 is a view showing various embodiments of an internalconfiguration of the vacuum space part. First, referring to FIG. 3 a ,the vacuum space part 50 is provided in a third space having a differentpressure from the first and second spaces, preferably, a vacuum state,thereby reducing adiabatic loss. The third space may be provided at atemperature between the temperature of the first space and thetemperature of the second space. Since the third space is provided as aspace in the vacuum state, the first and second plate members 10 and 20receive a force contracting in a direction in which they approach eachother due to a force corresponding to a pressure difference between thefirst and second spaces. Therefore, the vacuum space part 50 may bedeformed in a direction in which it is reduced. In this case, adiabaticloss may be caused due to an increase in amount of heat radiation,caused by the contraction of the vacuum space part 50, and an increasein amount of heat conduction, caused by contact between the platemembers 10 and 20.

A supporting unit (or support) 30 may be provided to reduce thedeformation of the vacuum space part 50. The supporting unit 30 includesbars 31. The bars 31 may extend in a direction substantially vertical tothe first and second plate members 10 and 20 so as to support a distancebetween the first and second plate members 10 and 20. A support plate 35may be additionally provided to at least one end of the bar 31. Thesupport plate 35 connects at least two bars 31 to each other, and mayextend in a direction horizontal to the first and second plate members10 and 20.

The support plate 35 may be provided in a plate shape, or may beprovided in a lattice shape such that its area contacting the first orsecond plate member 10 or 20 is decreased, thereby reducing heattransfer. The bars 31 and the support plate 35 are fixed to each otherat at least one portion, to be inserted together between the first andsecond plate members 10 and 20. The support plate 35 contacts at leastone of the first and second plate members 10 and 20, thereby preventingdeformation of the first and second plate members 10 and 20.

In addition, based on the extending direction of the bars 31, a totalsectional area of the support plate 35 is provided to be greater thanthat of the bars 31, so that heat transferred through the bars 31 can bediffused through the support plate 35. A material of the supporting unit30 may include a resin selected from the group consisting of PC, glassfiber PC, low outgassing PC, PPS, and LCP so as to obtain highcompressive strength, low outgassing and water absorptance, low thermalconductivity, high compressive strength at high temperature, andexcellent machinability.

A radiation resistance sheet 32 for reducing heat radiation between thefirst and second plate members 10 and 20 through the vacuum space part50 will be described. The first and second plate members 10 and 20 maybe made of a stainless material capable of preventing corrosion andproviding a sufficient strength. The stainless material has a relativelyhigh emissivity of 0.16, and hence a large amount of radiation heat maybe transferred.

In addition, the supporting unit 30 made of the resin has a loweremissivity than the plate members, and is not entirely provided to innersurfaces of the first and second plate members 10 and 20. Hence, thesupporting unit 30 does not have great influence on radiation heat.Therefore, the radiation resistance sheet 32 may be provided in a plateshape over a majority of the area of the vacuum space part 50 so as toconcentrate on reduction of radiation heat transferred between the firstand second plate members 10 and 20.

A product having a low emissivity may be preferably used as the materialof the radiation resistance sheet 32. In an embodiment, an aluminum foilhaving an emissivity of 0.02 may be used as the radiation resistancesheet 32. Since the transfer of radiation heat cannot be sufficientlyblocked using one radiation resistance sheet, at least two radiationresistance sheets 32 may be provided at a certain distance so as not tocontact each other. In addition, at least one radiation resistance sheetmay be provided in a state in which it contacts the inner surface of thefirst or second plate member 10 or 20.

Referring to FIG. 3 b , the distance between the plate members ismaintained by the supporting unit 30, and a porous material 33 may befilled in the vacuum space part 50. The porous material 33 may have ahigher emissivity than the stainless material of the first and secondplate members 10 and 20. However, since the porous material 33 is filledin the vacuum space part 50, the porous material 33 has a highefficiency for blocking the transfer of radiation heat. In thisembodiment, the vacuum adiabatic body can be manufactured without usingthe radiation resistance sheet 32.

Referring to FIG. 3 c , the supporting unit 30 maintaining the vacuumspace part 50 is not provided. Instead of the supporting unit 30, theporous material 33 is provided in a state in which it is surrounded by afilm 34. In this case, the porous material 33 may be provided in a statein which it is compressed so as to maintain the gap of the vacuum spacepart 50. The film 34 is made of, for example, a PE material, and may beprovided in a state in which holes are formed therein.

In this embodiment, the vacuum adiabatic body can be manufacturedwithout using the supporting unit 30. In other words, the porousmaterial 33 can serve together as the radiation resistance sheet 32 andthe supporting unit 30.

FIG. 4 is a view showing various embodiments of the conductiveresistance sheets and peripheral parts thereof. Structures of theconductive resistance sheets are briefly illustrated in FIG. 2 , butwill be understood in detail with reference to FIG. 4 .

First, a conductive resistance sheet proposed in FIG. 4 a may bepreferably applied to the main body-side vacuum adiabatic body.Specifically, the first and second plate members 10 and 20 are to besealed so as to vacuumize the interior of the vacuum adiabatic body. Inthis case, since the two plate members have different temperatures fromeach other, heat transfer may occur between the two plate members. Aconductive resistance sheet 60 is provided to prevent heat conductionbetween two different kinds of plate members.

The conductive resistance sheet 60 may be provided with sealing parts 61at which both ends of the conductive resistance sheet 60 are sealed todefine at least one portion of the wall for the third space and maintainthe vacuum state. The conductive resistance sheet 60 may be provided asa thin foil in units of micrometers so as to reduce the amount of heatconducted along the wall for the third space. The sealing parts 61 maybe provided as welding parts. That is, the conductive resistance sheet60 and the plate members 10 and 20 may be fused to each other.

In order to cause a fusing action between the conductive resistancesheet 60 and the plate members 10 and 20, the conductive resistancesheet 60 and the plate members 10 and 20 may be made of the samematerial, and a stainless material may be used as the material. Thesealing parts 61 are not limited to the welding parts, and may beprovided through a process such as cocking. The conductive resistancesheet 60 may be provided in a curved shape. Thus, a heat conductiondistance of the conductive resistance sheet 60 is provided longer thanthe linear distance of each plate member, so that the amount of heatconduction can be further reduced.

A change in temperature occurs along the conductive resistance sheet 60.Therefore, in order to block heat transfer to the exterior of theconductive resistance sheet 60, a shielding part (or shield) 62 may beprovided at the exterior of the conductive resistance sheet 60 such thatan adiabatic action occurs. In other words, in the refrigerator, thesecond plate member 20 has a high temperature and the first plate member10 has a low temperature. In addition, heat conduction from hightemperature to low temperature occurs in the conductive resistance sheet60, and hence the temperature of the conductive resistance sheet 60 issuddenly changed. Therefore, when the conductive resistance sheet 60 isopened to the exterior thereof, heat transfer through the opened placemay seriously occur.

In order to reduce heat loss, the shielding part 62 is provided at theexterior of the conductive resistance sheet 60. For example, when theconductive resistance sheet 60 is exposed to any one of thelow-temperature space and the high-temperature space, the conductiveresistance sheet 60 does not serve as a conductive resistor as well asthe exposed portion thereof, which is not preferable.

The shielding part 62 may be provided as a porous material contacting anouter surface of the conductive resistance sheet 60. The shielding part62 may be provided as an adiabatic structure, e.g., a separate gasket,which is placed at the exterior of the conductive resistance sheet 60.The shielding part 62 may be provided as a portion of the vacuumadiabatic body, which is provided at a position facing a correspondingconductive resistance sheet 60 when the main body-side vacuum adiabaticbody is closed with respect to the door-side vacuum adiabatic body. Inorder to reduce heat loss even when the main body and the door areopened, the shielding part 62 may be preferably provided as a porousmaterial or a separate adiabatic structure.

A conductive resistance sheet proposed in FIG. 4 b may be preferablyapplied to the door-side vacuum adiabatic body. In FIG. 4 b , portionsdifferent from those of FIG. 4 a are described in detail, and the samedescription is applied to portions identical to those of FIG. 4 a . Aside frame 70 is further provided at an outside of the conductiveresistance sheet 60. A part for sealing between the door and the mainbody, an exhaust port necessary for an exhaust process, a getter portfor vacuum maintenance, and the like may be placed on the side frame 70.This is because the mounting of parts is convenient in the mainbody-side vacuum adiabatic body, but the mounting positions of parts arelimited in the door-side vacuum adiabatic body.

In the door-side vacuum adiabatic body, it is difficult to place theconductive resistance sheet 60 at a front end portion of the vacuumspace part, i.e., a corner side portion of the vacuum space part. Thisis because, unlike the main body, a corner edge portion of the door isexposed to the exterior. More specifically, if the conductive resistancesheet 60 is placed at the front end portion of the vacuum space part,the corner edge portion of the door is exposed to the exterior, andhence there is a disadvantage in that a separate adiabatic part shouldbe configured so as to improve the adiabatic performance of theconductive resistance sheet 60.

A conductive resistance sheet proposed in FIG. 4 c may be preferablyinstalled in the pipeline passing through the vacuum space part. In FIG.4 c , portions different from those of FIGS. 4 a and 4 b are describedin detail, and the same description is applied to portions identical tothose of FIGS. 4 a and 4 b . A conductive resistance sheet having thesame shape as that of FIG. 4 a , preferably, a wrinkled conductiveresistance sheet 63 may be provided at a peripheral portion of thepipeline 64. Accordingly, a heat transfer path can be lengthened, anddeformation caused by a pressure difference can be prevented. Inaddition, a separate shielding part may be provided to improve theadiabatic performance of the conductive resistance sheet.

A heat transfer path between the first and second plate members 10 and20 will be described with reference back to FIG. 4 a . Heat passingthrough the vacuum adiabatic body may be divided into surface conductionheat {circle around (1)} conducted along a surface of the vacuumadiabatic body, more specifically, the conductive resistance sheet 60,supporter conduction heat {circle around (2)} conducted along thesupporting unit 30 provided inside the vacuum adiabatic body, gasconduction heat (or convection) {circle around (3)} conducted through aninternal gas in the vacuum space part, and radiation transfer heat{circle around (4)} transferred through the vacuum space part.

The transfer heat may be changed depending on various design dimensions.For example, the supporting unit may be changed such that the first andsecond plate members 10 and 20 can endure a vacuum pressure withoutbeing deformed, the vacuum pressure may be changed, the distance betweenthe plate members may be changed, and the length of the conductiveresistance sheet may be changed. The transfer heat may be changeddepending on a difference in temperature between the spaces (the firstand second spaces) respectively provided by the plate members. In theembodiment, a preferred configuration of the vacuum adiabatic body hasbeen found by considering that its total heat transfer amount is smallerthan that of a typical adiabatic structure formed by foamingpolyurethane. In a typical refrigerator including the adiabaticstructure formed by foaming the polyurethane, an effective heat transfercoefficient may be proposed as 19.6 mW/mK.

By performing a relative analysis on heat transfer amounts of the vacuumadiabatic body of the embodiment, a heat transfer amount by the gasconduction heat {circle around (3)} can become smallest. For example,the heat transfer amount by the gas conduction heat {circle around (3)}may be controlled to be equal to or smaller than 4% of the total heattransfer amount. A heat transfer amount by solid conduction heat definedas a sum of the surface conduction heat {circle around (1)} and thesupporter conduction heat {circle around (2)} is largest. For example,the heat transfer amount by the solid conduction heat may reach 75% ofthe total heat transfer amount. A heat transfer amount by the radiationtransfer heat {circle around (4)} is smaller than the heat transferamount by the solid conduction heat but larger than the heat transferamount of the gas conduction heat {circle around (3)}. For example, theheat transfer amount by the radiation transfer heat {circle around (4)}may occupy about 20% of the total heat transfer amount.

According to such a heat transfer distribution, effective heat transfercoefficients (eK: effective K) (W/mK) of the surface conduction heat{circle around (1)}, the supporter conduction heat {circle around (2)},the gas conduction heat {circle around (3)}, and the radiation transferheat {circle around (4)} may have an order of Math Figure 1.

eK_(solidconductionheat)>eK_(radiationtransferheat)>eK_(gasconductionheat)  [MathFigure 1]

Here, the effective heat transfer coefficient (eK) is a value that canbe measured using a shape and temperature differences of a targetproduct. The effective heat transfer coefficient (eK) is a value thatcan be obtained by measuring a total heat transfer amount and atemperature of at least one portion at which heat is transferred. Forexample, a calorific value (W) is measured using a heating source thatcan be quantitatively measured in the refrigerator, a temperaturedistribution (K) of the door is measured using heats respectivelytransferred through a main body and an edge of the door of therefrigerator, and a path through which heat is transferred is calculatedas a conversion value (m), thereby evaluating an effective heat transfercoefficient.

The effective heat transfer coefficient (eK) of the entire vacuumadiabatic body is a value given by k=QL/AΔT. Here, Q denotes a calorificvalue (W) and may be obtained using a calorific value of a heater. Adenotes a sectional area (m2) of the vacuum adiabatic body, L denotes athickness (m) of the vacuum adiabatic body, and ΔT denotes a temperaturedifference.

For the surface conduction heat, a conductive calorific value may beobtained through a temperature difference (ΔT) between an entrance andan exit of the conductive resistance sheet 60 or 63, a sectional area(A) of the conductive resistance sheet, a length (L) of the conductiveresistance sheet, and a thermal conductivity (k) of the conductiveresistance sheet (the thermal conductivity of the conductive resistancesheet is a material property of a material and can be obtained inadvance). For the supporter conduction heat, a conductive calorificvalue may be obtained through a temperature difference (ΔT) between anentrance and an exit of the supporting unit 30, a sectional area (A) ofthe supporting unit, a length (L) of the supporting unit, and a thermalconductivity (k) of the supporting unit.

Here, the thermal conductivity of the supporting unit is a materialproperty of a material and can be obtained in advance. The sum of thegas conduction heat {circle around (3)}, and the radiation transfer heat{circle around (4)} may be obtained by subtracting the surfaceconduction heat and the supporter conduction heat from the heat transferamount of the entire vacuum adiabatic body. A ratio of the gasconduction heat {circle around (3)}, and the radiation transfer heat{circle around (4)} may be obtained by evaluating radiation transferheat when no gas conduction heat exists by remarkably lowering a vacuumdegree of the vacuum space part 50.

When a porous material is provided inside the vacuum space part 50,porous material conduction heat {circle around (5)} may be a sum of thesupporter conduction heat {circle around (2)} and the radiation transferheat {circle around (4)}. The porous material conduction heat {circlearound (5)} may be changed depending on various variables including akind, an amount, and the like of the porous material.

According to an embodiment, a temperature difference ΔT1 between ageometric center formed by adjacent bars 31 and a point at which each ofthe bars 31 is located may be preferably provided to be less than 0.5°C. Also, a temperature difference ΔT2 between the geometric centerformed by the adjacent bars 31 and an edge portion of the vacuumadiabatic body may be preferably provided to be less than 0.5° C. In thesecond plate member 20, a temperature difference between an averagetemperature of the second plate and a temperature at a point at which aheat transfer path passing through the conductive resistance sheet 60 or63 meets the second plate may be largest.

For example, when the second space is a region hotter than the firstspace, the temperature at the point at which the heat transfer pathpassing through the conductive resistance sheet meets the second platemember becomes lowest. Similarly, when the second space is a regioncolder than the first space, the temperature at the point at which theheat transfer path passing through the conductive resistance sheet meetsthe second plate member becomes highest.

This means that the amount of heat transferred through other pointsexcept the surface conduction heat passing through the conductiveresistance sheet should be controlled, and the entire heat transferamount satisfying the vacuum adiabatic body can be achieved only whenthe surface conduction heat occupies the largest heat transfer amount.To this end, a temperature variation of the conductive resistance sheetmay be controlled to be larger than that of the plate member.

Physical characteristics of the parts constituting the vacuum adiabaticbody will be described. In the vacuum adiabatic body, a force by vacuumpressure is applied to all of the parts. Therefore, a material having astrength (N/m2) of a certain level may be preferably used.

Under such circumferences, the plate members 10 and 20 and the sideframe 70 may be preferably made of a material having a sufficientstrength with which they are not damaged by even vacuum pressure. Forexample, when the number of bars 31 is decreased so as to limit thesupport conduction heat, deformation of the plate member occurs due tothe vacuum pressure, which may be a bad influence on the externalappearance of refrigerator. The radiation resistance sheet 32 may bepreferably made of a material that has a low emissivity and can beeasily subjected to thin film processing. Also, the radiation resistancesheet 32 is to ensure a strength high enough not to be deformed by anexternal impact. The supporting unit 30 is provided with a strength highenough to support the force by the vacuum pressure and endure anexternal impact, and is to have machinability. The conductive resistancesheet 60 may be preferably made of a material that has a thin plateshape and can endure the vacuum pressure.

In an embodiment, the plate member, the side frame, and the conductiveresistance sheet may be made of stainless materials having the samestrength. The radiation resistance sheet may be made of aluminum havinga weaker strength that the stainless materials. The supporting unit maybe made of resin having a weaker strength than the aluminum.

Unlike the strength from the point of view of materials, analysis fromthe point of view of stiffness is required. The stiffness (N/m) is aproperty that would not be easily deformed. Although the same materialis used, its stiffness may be changed depending on its shape. Theconductive resistance sheets 60 or 63 may be made of a material having apredetermined strength, but the stiffness of the material is preferablylow so as to increase heat resistance and minimize radiation heat as theconductive resistance sheet is uniformly spread without any roughnesswhen the vacuum pressure is applied. The radiation resistance sheet 32requires a stiffness of a certain level so as not to contact anotherpart due to deformation. Particularly, an edge portion of the radiationresistance sheet may generate conduction heat due to drooping caused bythe self-load of the radiation resistance sheet. Therefore, a stiffnessof a certain level is required. The supporting unit 30 requires astiffness high enough to endure a compressive stress from the platemember and an external impact.

In an embodiment, the plate member and the side frame may preferablyhave the highest stiffness so as to prevent deformation caused by thevacuum pressure. The supporting unit, particularly, the bar maypreferably have the second highest stiffness. The radiation resistancesheet may preferably have a stiffness that is lower than that of thesupporting unit but higher than that of the conductive resistance sheet.

The conductive resistance sheet may be preferably made of a materialthat is easily deformed by the vacuum pressure and has the loweststiffness. Even when the porous material 33 is filled in the vacuumspace part 50, the conductive resistance sheet may preferably have thelowest stiffness, and the plate member and the side frame may preferablyhave the highest stiffness.

FIG. 5 is a view showing in detail a vacuum adiabatic body according toanother embodiment. The embodiment shown in FIG. 5 may be preferablyapplied to the door-side vacuum adiabatic body, and the description ofthe vacuum adiabatic body shown in FIG. 4 b among the vacuum adiabaticbodies shown in FIG. 4 may be applied to parts not described in detailwith reference to FIG. 5 .

Referring to FIG. 5 , the vacuum adiabatic body of the embodiment mayinclude a first plate member 10, a second plate member 20, a conductiveresistance sheet 60, and a side frame 70. The side frame 70 provides apath through which solid conduction heat passing through the conductiveresistance sheet 60 passes. However, in the refrigerator, cold air maybe reduced in a process in which it passes through the conductiveresistance sheet 60, but can be sufficiently resisted while flowingalong the side frame 70. The side frame 70 may be formed thinner thanthe first plate member 10 so as to resist the cold air passing throughthe conductive resistance sheet 60.

The side frame 70 is formed in a bent shape, and may be provided suchthat the height of an outer portion, i.e., an edge portion when viewedfrom the entire shape of the vacuum adiabatic body is lowered. The sideframe 70 may be provided in a shape in which a gap part between the sideframe 70 and the second plate member 20 is divided into a part having ahigh height and a part having a low height.

According to the above-described shape, the part at which the height ofthe side frame 70 is low can ensure a predetermined space as comparedwith another part at the exterior of the vacuum adiabatic body.Accordingly, it is possible to maximally ensure the internal volume of aproduct such as the refrigerator provided by the vacuum adiabatic body,to improve an adiabatic effect, and to sufficiently ensure functions ofthe product.

The side frame 70 includes a first mounting surface 71 on which theconductive resistance sheet 60 is mounted to be fastened to the sideframe 70, a second mounting surface 73 on which an addition is mounted,and a connection part or wall 72 connecting the first and secondmounting surfaces 71 and 73 to each other. The addition may include adoor hinge, an adiabatic member, etc. The conductive resistance sheet 60may be fastened to the first plate member 10 and the side frame 70 bysealing parts 61, and thus the vacuum state of a vacuum space part canbe maintained.

The periphery of the second mounting surface 73 may be connected to anedge portion of the second plate member 20. In this case, the secondmounting surface 73 and the second plate 20 may be connected to eachother through welding. Therefore, it may be considered that the secondmounting surface 73 is coupled at an edge portion of the vacuumadiabatic body.

A supporting unit includes support plates 35 and 36 and at least one bar311 and 312 interposed between the support plates 35 and 36. The atleast one bar 311 and 312 includes a first bar 311 for maintaining a gapbetween the first and second plate members 10 and 20, and a second bar312 for maintaining a gap between the side frame 70 and the second platemember 20.

The second mounting surface 73 may be supported by the second bar 312.Specifically, the second bar 312 may be connected to a bottom surface ofthe second mounting surface 73. On the other hand, any separate supportmember may not be connected to a bottom surface of the first mountingsurface 71.

That is, the first mounting surface 71 is connected to the connectionpart 72 to be supported by the second mounting surface 73. Therefore, alength L1 of the first mounting surface 71 may be formed shorter than alength L2 of the second mounting surface 73. The supporting unit is notprovided at the bottom of the first mounting surface 71, and hence thelength of the second mounting surface 73 may be formed longer, which iseffective from the point of view of strength.

A vertical distance between the second mounting surface 73 and thesecond plate member 20 may be formed shorter than that between the firstmounting surface 71 and the second plate member 20. Accordingly, it ispossible to maximally ensure the internal volume of a product such asthe refrigerator provided by the vacuum adiabatic body, to improve anadiabatic effect, and to sufficiently ensure functions of the product.

Meanwhile, a force in the direction of the vacuum space part of thevacuum adiabatic body is applied to the side frame 70 by a difference inatmospheric pressure between the vacuum space part and the atmosphere,and hence drooping of the first mounting surface 71 may occur.Therefore, the length of the first mounting surface 71 is to be limitedto a predetermined value or less.

However, the first mounting surface 71 is to ensure a space in which theconductive resistance sheet 60 is to be welded, and therefore, thelength the first mounting surface 71 is to have a predetermined value ormore. When welding is performed, the conductive resistance sheet 60 isadhered closely to the first mounting surface 71 using a jig and thenwelded to the first mounting surface 71.

The connection part 72, as shown in FIG. 5 , may extend in a directionperpendicular to the second mounting surface 73, but the presentdisclosure is not limited to such a configuration. For example, theconnection part 72 may be disposed to form an acute or obtuse angle withthe second mounting surface 73.

The side frame 70 may further include a reinforcing member (not shown)for connecting the second mounting surface 73 and the connection part 72to each other so as to prevent warp thereof. The reinforcing member (notshown) may connect an upper end of the connection part 72 and the secondmounting part 73 to each other.

Hereinafter, a design of a thickness of the side frame 70 and a lengthof the second mounting surface 73, which satisfy a deformationcondition, will be described. In addition, the connection part 72 maynot be provided or may be formed to have a small size, and therefore, adistance L3 from an inner end of the first mounting surface 71 to aninner end of the second mounting surface 73 is defined as the length ofthe first mounting surface 71. The length L3 of the first mountingsurface 71 may correspond to the thickness of the vacuum adiabatic body.

FIG. 6 illustrates graphs showing minimum thicknesses of the side framewith respect to limiting stresses of the side frame. Referring to FIG. 6, the vertical axis represents limiting stresses of the side frame 70,and the horizontal axis represents minimum thicknesses of the side frame70 with respect to the limiting stresses of the side frame 70. That is,as the limiting stress is set to be higher in a design of the side frame70, the minimum thickness of the side frame 70 becomes smaller.

For example, when the limiting stress is set to a rupture stress in thedesign of the side frame 70, the minimum thickness becomes smaller thanthat when the limiting stress is set to a yield stress. This is becausethe rupture stress is larger than the yield stress.

In addition, as the length L3 of the first mounting surface 71 of theside frame 70 becomes longer, the graphs move to the right side. Thatis, it can be seen through the graphs that, if the side frame 70 isdesigned to have the same limiting stress, the minimum thickness of theside frame 70 is to be increased.

The graphs are analyzed using the side frame 70 made of stainless steelsuch as STS304 having a low thermal conductivity and a high strength.The side frame 70 may be made of titanium, iron, or the like. However,in this case, shapes of graphs are hardly different from those of thegraphs shown in FIG. 6 .

FIG. 7 illustrates graphs showing relationships between lengths of thefirst mounting surface and minimum thicknesses of the side frame.Referring to FIG. 7 , the horizontal axis represents lengths L3 of thefirst mounting surface 71, and the vertical axis represents minimumthicknesses of the side frame 70. It can be seen that the stress designreference is satisfied when the minimum thickness of the side frame 70is increased as the length L3 of the first mounting surface 71 isincreased.

When the side frame 70 is designed based on a yield stress (240 MPa), agraph is disposed over that when the side frame 70 is designed based ona rupture stress (505 MPa). That is, when lengths L3 of the firstmounting surface 71 are the same, a minimum thickness of the side frame70 when the side frame 70 is designed based on the yield stress isfurther increased than that of the side frame 70 when the side frame 70is designed based on the rupture stress.

By using the graphs, a minimum thickness of the side frame with respectto a length L3 of the first mounting surface 71 may be determinedaccording to the stress design reference. For example, when the lengthL3 of the first mounting surface 71 is 6 mm, the minimum thickness ofthe side frame 70 is to be designed to be 0.35 mm or more so as toprevent rupture of the side frame 70.

It may be defined that the length L3 of the first mounting surface 71 isx and the minimum thickness of the side frame 70 is y. When the sideframe 70 is designed based on the yield stress, the range of minimumthicknesses of the side frame 70 may be designed to satisfy aninequality of y>0.034×x+0.287. This represents a graph disposed at alower portion on the drawing.

When the side frame 70 is designed based on the rupture stress, therange of minimum thicknesses of the side frame 70 may be designed tosatisfy an inequality of y>0.023×x+0.2. This represents a graph disposedat an upper portion on the drawing. Thus, it can be seen that, when theside frame 70 is designed based on the rupture stress, the range ofminimum thicknesses of the side frame 70 is wider.

Meanwhile, the minimum thickness of the side frame 70 may be designed tobe equal to or greater than 0.5 mm and equal to or smaller than 2.0 mm.The range is a range for satisfying strength and weight conditions ofthe side frame 70. Also, the length L3 of the first mounting surface 71may be designed to be equal to or greater than 3 mm and equal to orsmaller than 30 mm.

FIG. 8 illustrates graphs showing relationships between thicknesses ofthe side frame and deformations of the side frame. Referring to FIG. 8 ,as the thickness of the side frame 70 is decreased, the deformation ofthe side frame 70 is increased. Also, since the graphs move to the rightside as the length L3 of the first mounting surface 71 is increased, itcan be seen that, when the thickness of the side frame 70 is constant,the deformation of the side frame 70 is increased as the length L3 ofthe first mounting surface 71 is increased.

The deformation of the side frame 70 may cause deformation of theconductive resistance sheet 60, and it is highly likely that thedeformation of the side frame 70 will cause a problem when the sideframe 70 is fastened to other parts. Hence, the side frame 70 is to bedesigned such that the deformation of the side frame 70 is within acertain range.

FIG. 9 illustrates graphs showing relationships between lengths of thefirst mounting surface and minimum thicknesses of the side frame.Referring to FIG. 9 , the horizontal axis represents lengths L3 of thefirst mounting surface 71, and the vertical axis represents minimumthicknesses of the side frame 70. Here, it may be defined that thelength L3 of the first mounting surface 71 is x and the minimumthickness of the side frame 70 is y. Two graphs represent when apermissible tolerance is 0.5 mm and when a permissible tolerance is 1mm, respectively.

Specifically, a graph disposed at an upper portion on the drawing is agraph representing when the permissible tolerance is 0.5 mm, andsatisfies an inequality of y>0.0238×x+0.12. A graph disposed at a lowerportion on the drawing is a graph representing when the permissibletolerance is 1 mm, and satisfies an inequality of y>0.0175×x+0.0833.

Therefore, as the permissible tolerance is decreased, the minimumthickness of the side frame 70 is to be designed to be increased. Forexample, when the length L3 of the first mounting surface 71 is 12 mm,the minimum thickness of the side frame 70 is to be designed to be 0.3mm or more so as to control the permissible tolerance to be within 1 mm.Also, the minimum thickness of the side frame 70 is to be designed to be0.4 mm or more so as to control the permissible tolerance to be within0.5 mm.

Hereinafter, a vacuum pressure preferably determined depending on aninternal state of the vacuum adiabatic body will be described. Asalready described above, a vacuum pressure is to be maintained insidethe vacuum adiabatic body so as to reduce heat transfer. At this time,it will be easily expected that the vacuum pressure is preferablymaintained as low as possible so as to reduce the heat transfer.

The vacuum space part 50 may resist the heat transfer by applying onlythe supporting unit 30. Alternatively, the porous material 33 may befilled together with the supporting unit in the vacuum space part 50 toresist the heat transfer. Alternatively, the vacuum space part mayresist the heat transfer not by applying the supporting unit but byapplying the porous material 33.

The case where only the supporting unit is applied will be described.FIG. 10 illustrates graphs showing changes in adiabatic performance andchanges in gas conductivity with respect to vacuum pressures by applyinga simulation. Referring to FIG. 10 , it can be seen that, as the vacuumpressure is decreased, i.e., as the vacuum degree is increased, a heatload in the case of only the main body (Graph 1) or in the case wherethe main body and the door are joined together (Graph 2) is decreased ascompared with that in the case of the typical product formed by foamingpolyurethane, thereby improving the adiabatic performance. However, itcan be seen that the degree of improvement of the adiabatic performanceis gradually lowered. Also, it can be seen that, as the vacuum pressureis decreased, the gas conductivity (Graph 3) is decreased.

However, it can be seen that, although the vacuum pressure is decreased,the ratio at which the adiabatic performance and the gas conductivityare improved is gradually lowered. Therefore, it is preferable that thevacuum pressure is decreased as low as possible. However, it takes longtime to obtain excessive vacuum pressure, and much cost is consumed dueto excessive use of a getter. In the embodiment, an optimal vacuumpressure is proposed from the above-described point of view.

FIG. 11 illustrates graphs obtained by observing, over time andpressure, a process of exhausting the interior of the vacuum adiabaticbody when the supporting unit is used. Referring to FIG. 11 , in orderto create the vacuum space part 50 to be in the vacuum state, a gas inthe vacuum space part 50 is exhausted by a vacuum pump while evaporatinga latent gas remaining in the parts of the vacuum space part 50 throughbaking. However, if the vacuum pressure reaches a certain level or more,there exists a point at which the level of the vacuum pressure is notincreased any more (Δt1).

After that, the getter is activated by disconnecting the vacuum spacepart 50 from the vacuum pump and applying heat to the vacuum space part50 (Δt2). If the getter is activated, the pressure in the vacuum spacepart 50 is decreased for a certain period of time, but then normalizedto maintain a vacuum pressure of a certain level. The vacuum pressurethat maintains the certain level after the activation of the getter isapproximately 1.8×10{circumflex over ( )}(−6) Torr. In the embodiment, apoint at which the vacuum pressure is not substantially decreased anymore even though the gas is exhausted by operating the vacuum pump isset to the lowest limit of the vacuum pressure used in the vacuumadiabatic body, thereby setting the minimum internal pressure of thevacuum space part 50 to 1.8×10{circumflex over ( )}(−6) Torr.

FIG. 12 illustrates graphs obtained by comparing vacuum pressures andgas conductivities. Referring to FIG. 12 , gas conductivities withrespect to vacuum pressures depending on sizes of a gap in the vacuumspace part 50 are represented as graphs of effective heat transfercoefficients (eK). Effective heat transfer coefficients (eK) weremeasured when the gap in the vacuum space part 50 has three sizes of2.76 mm, 6.5 mm, and 12.5 mm.

The gap in the vacuum space part 50 is defined as follows. When theradiation resistance sheet 32 exists inside vacuum space part 50, thegap is a distance between the radiation resistance sheet 32 and theplate member adjacent thereto. When the radiation resistance sheet 32does not exist inside vacuum space part 50, the gap is a distancebetween the first and second plate members.

It can be seen that, since the size of the gap is small at a pointcorresponding to a typical effective heat transfer coefficient of 0.0196W/mK, which is provided to an adiabatic material formed by foamingpolyurethane, the vacuum pressure is 2.65×10{circumflex over ( )}(−1)Torr even when the size of the gap is 2.76 mm. Meanwhile, it can be seenthat the point at which reduction in adiabatic effect caused by gasconduction heat is saturated even though the vacuum pressure isdecreased is a point at which the vacuum pressure is approximately4.5×10{circumflex over ( )}(−3) Torr. The vacuum pressure of4.5×10{circumflex over ( )}(−3) Torr can be defined as the point atwhich the reduction in adiabatic effect caused by gas conduction heat issaturated. Also, when the effective heat transfer coefficient is 0.1W/mK, the vacuum pressure is 1.2×10{circumflex over ( )}(−2) Torr.

When the vacuum space part 50 is not provided with the supporting unitbut provided with the porous material, the size of the gap ranges from afew micrometers to a few hundredths of micrometers. In this case, theamount of radiation heat transfer is small due to the porous materialeven when the vacuum pressure is relatively high, i.e., when the vacuumdegree is low. Therefore, an appropriate vacuum pump is used to adjustthe vacuum pressure. The vacuum pressure appropriate to thecorresponding vacuum pump is approximately 2.0×10{circumflex over( )}(−4) Torr.

Also, the vacuum pressure at the point at which the reduction inadiabatic effect caused by gas conduction heat is saturated isapproximately 4.7×10{circumflex over ( )}(−2) Torr. Also, the pressurewhere the reduction in adiabatic effect caused by gas conduction heatreaches the typical effective heat transfer coefficient of 0.0196 W/mKis 730 Torr. When the supporting unit and the porous material areprovided together in the vacuum space part, a vacuum pressure may becreated and used, which is middle between the vacuum pressure when onlythe supporting unit is used and the vacuum pressure when only the porousmaterial is used.

The vacuum adiabatic body proposed in the present disclosure may bepreferably applied to refrigerators. However, the application of thevacuum adiabatic body is not limited to the refrigerators, and may beapplied in various apparatuses such as cryogenic refrigeratingapparatuses, heating apparatuses, and ventilation apparatuses.

According to the present disclosure, the vacuum adiabatic body can beindustrially applied to various adiabatic apparatuses. The adiabaticeffect can be enhanced, so that it is possible to improve energy useefficiency and to increase the effective volume of an apparatus.

What is claimed is:
 1. A vacuum adiabatic body comprising: a first plateto have a first temperature; a second plate to have a second temperaturedifferent from the first temperature; a vacuum space to be providedbetween the first plate and the second plate, and the vacuum space to beprovided in a vacuum state; a conductive resistance sheet configured toresist heat transfer between the first plate and the second plate, and aportion of the conductive resistance sheet being connected to at leastone of the first and second plate.
 2. The vacuum adiabatic bodyaccording to claim 1, wherein the side frame includes a connection wallconnecting a first mounting surface and a second mounting surface toeach other, the connection wall is provided to a main portion of thevacuum adiabatic body without being provided to an edge portion of thevacuum adiabatic body, wherein the main portion of the vacuum adiabaticbody is disposed at an inner side of the vacuum adiabatic body than theedge portion of the vacuum adiabatic body.
 3. The vacuum adiabatic bodyaccording to claim 1, wherein the side frame having a first mountingsurface connected to the first plate, wherein the first mounting surfaceis provided to a main portion of the vacuum adiabatic body without beingprovided to an edge portion of the vacuum adiabatic body, wherein themain portion of the vacuum adiabatic body is disposed at an inner sideof the vacuum adiabatic body than the edge portion of the vacuumadiabatic body.
 4. The vacuum adiabatic body according to claim 1,wherein the side frame having a second mounting surface connected to thesecond plate, wherein the second mounting surface is provided to an edgeportion of the vacuum adiabatic body without being provided to a mainportion of the vacuum adiabatic body, wherein the main portion of thevacuum adiabatic body is disposed at an inner side of the vacuumadiabatic body than the edge portion of the vacuum adiabatic body.
 5. Avacuum adiabatic body comprising: a first plate to have a firsttemperature; a second plate to have a second temperature different fromthe first temperature; a vacuum space to be provided between the firstplate and the second plate, and the vacuum space to be provided in avacuum state; a conductive resistance sheet configured to resist heattransfer between the first plate and the second plate, and a portion ofthe conductive resistance sheet being connected to at least one of thefirst and second plate; and wherein the side frame includes a connectionwall connecting a first mounting surface and a second mounting surfaceto each other.
 6. The vacuum adiabatic body according to claim 5,wherein a heat conduction distance of the side frame is be providedlonger than the linear distance of the first and second plate such thata heat conduction transferring via the side frame may be reduced.
 7. Thevacuum adiabatic body according to the claim 5, wherein the first andsecond mounting surface extends in a different direction from eachother.
 8. The vacuum adiabatic body according to the claim 7, whereinthe first and second mounting surface extends in an opposite directionfrom each other.
 9. The vacuum adiabatic body according to the claim 5,wherein the first mounting surface have a different height from thesecond mounting surface.
 10. The vacuum adiabatic body according to theclaim 9, wherein the first mounting surface have a higher height fromthe second mounting surface.
 11. The vacuum adiabatic body according tothe claim 5, comprising a support configured to maintain a distancebetween the first plate and second plate, wherein the first mountingsurface is not supported by the support but the second mounting surfaceis supported by the support.
 12. The vacuum adiabatic body according toclaim 5, wherein a portion of the side frame are connected with aportion of the conductive resistance sheet, after the side frame and theconductive resistance sheet are manufactured respectively so that theside frame and the conductive resistance sheet may be provided as aseparate component each other.
 13. The vacuum adiabatic body accordingto claim 12, wherein the other portion of the side frame is connected tothe second plate.
 14. The vacuum adiabatic body according to claim 12,wherein the other portion of the conductive resistance sheet isconnected to the first plate.
 15. A vacuum adiabatic body comprising: afirst plate to have a first temperature; a second plate to have a secondtemperature different from the first temperature; a vacuum space to beprovided between the first plate and the second plate, and the vacuumspace to be provided in a vacuum state; a conductive resistance sheetconfigured to resist heat transfer between the first plate and thesecond plate, and a portion of the conductive resistance sheet beingconnected to at least one of the first and second plate; a side framehaving a first mounting surface connected to the first plate; whereinthe side frame includes a portion having a less thickness than at leastone of the first and second plate such that a heat conductiontransferring via the side frame may be reduced.
 16. A vacuum adiabaticbody comprising: a first plate to have a first temperature; a secondplate to have a second temperature different from the first temperature;a vacuum space to be provided between the first plate and the secondplate, and the vacuum space to be provided in a vacuum state; aconductive resistance sheet configured to resist heat transfer betweenthe first plate and the second plate, and a portion of the conductiveresistance sheet being connected to at least one of the first and secondplate; and a side frame having a first mounting surface connected to thefirst plate, wherein the side frame has a bent shape and a heatconduction distance of the side frame is be provided longer than thelinear distance of the first and second plate such that a heatconduction transferring via the side frame may be reduced.